Had a Hyundai or Kia with a knock in the steering similar to the video below?
If so, it's likely that the vehicle has a worn MDPS (Motor Driven Power Steering) coupling bush.
Mechanic.com.au member Jon Wolridge from Maroochy Car Care kindly sent in some details regarding a recent repair he carried out on a Hyundai i30. It should be noted that this issue is prevalant on a number of Hyundai and Kia vehicles equipped with the MDPS (Motor Driven Power Steering) system.
Depending on the vehicle model and orientation of the power steering motor, the following items may need to be removed.
Once you have access to the steering column, remove the electronic control unit and wiring harnesses as required.
Be careful not to apply stress to the electrical harness and connectors.
Remove the 3 or 4 (Depending on model) T30 Torx bolts that fix the motor to the steering column and carefully remove the power steering motor.
In some instances, this repair can be done in-situe, in others the steering column may need to be removed from the vehicle in order to properly clean and realign the power steering motor and steering column.
Below we can see a comparison between the new replacement bush (top) and old worn bush removed from this vehicle (bottom).
It is critically important that any old bush material is removed from the coupling prior to installation of the new bush.
This might best be carried out using a vaccum cleaner and clean rag to sufficiently remove remnants of the worn bush.
It should also be noted that a collar and spring are located between the power steering motor and steering column that may fall out upon removal. Simply place these parts onto the power steering motor shaft after the new bush is fitted. (Parts shown below)
When refitting the power steering motor to the steering column, ensure the coupling is correctly lined up and that the power steering motor is pulled down evenly onto the steering column to assure proper alignment.
Carry out a steering angle sensor calibration if required and road test vehicle to ensure proper steering functionality.
